The development of the recently worded 1985 questions would then only apply to JWs baptized from that date. That is not the case with the WTS, they do not feel that members have to be rebaptized every time a change is made in doctrine or procedure. I have never heard a jw describe baptism as a contract with the WTS nor seen the WTS put that concept in writing in their publications.
They base the need not to rebaptize on the account in 1 Corinthians where the erring Christian brother was not required to get rebaptized or that God had to re-select him as going to heaven.
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w76 3/1 pp. 158-159 Questions From Readers
Can an anointed Christian who is disfellowshiped later be reinstated and still have the heavenly hope?
Yes, that is possible. Of course, in each case Jehovah God is the one to determine whether he will extend forgiveness.
The fact that this is possible is borne out by what we read in the apostle Paul’s letters to the Corinthian congregation. He wrote to Christians who had been anointed by holy spirit and given the hope of heavenly life. Paul addressed them as "you who have been sanctified in union with Christ Jesus, called to be holy ones."—1 Cor. 1:2; 15:49.
One of these anointed Christians began to practice fornication. When he evidently did not repent and stop his immorality, Paul directed the congregation to disfellowship him. (1 Cor. 5:1-5, 9-13) However, it seems that this disfellowshiped person thereafter did sincerely repent. He is understood to be the person whom Paul was referring to in his second letter when he advised the Corinthians to forgive and accept back the former sinner.—2 Cor. 2:6-11; 7:8-13.
When that man was reinstated into the congregation, what was his hope? Had he lost the heavenly calling, and had his hope now been changed to everlasting life on earth? No, for the earthly hope is not, as it were, a second-chance prospect. Abel, Enoch, Noah, Abraham and multitudes of other persons of outstanding faith had the hope of eternal life on earth, but this was not because they failed to measure up to the heavenly calling. They simply did not live in the time when the heavenly calling was in process according to Jehovah’s will. (Heb. 10:19, 20) Comparable faith and integrity are required of all who will gain everlasting life, whether in heaven or on a paradise earth. A Christian who is anointed with holy spirit and made a joint heir with Christ must prove faithful to that calling if he is to receive eternal life at all.—Rev. 2:10, 11; Phil. 3:8-14; Rom. 8:14-17.
This, though, does not mean that while they are on earth anointed Christians never sin. In the flesh, they are still imperfect and consequently they sin, as do all humans, and may even commit gross sin. The Christian disciple and Bible writer James, certainly an anointed Christian, wrote: "For we all stumble many times. If anyone does not stumble in word, this one is a perfect man." (Jas. 3:2; 2:5) It appears that such unintentional sin resulting from imperfection is what the apostle John meant by "sin that does not incur death." (1 John 5:16) God can forgive such sins. John said: "If we confess our sins, he is faithful and righteous so as to forgive us our sins and to cleanse us from all unrighteousness."—1 John 1:9.
But repentance is necessary. If an anointed Christian today practiced gross sin and did not manifest repentance, the congregation, out of obedience to God’s counsel, would have to disfellowship him. If he subsequently repented, though, he could be forgiven and reinstated, as was the man in Corinth.